Question 1

What is a Unix timestamp?

Accepted Answer

A Unix timestamp (epoch time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC. It's the standard way computers store and compare points in time regardless of timezone.

Question 2

How does the tool know if my number is seconds or milliseconds?

Accepted Answer

It counts the digits: 10 digits is treated as seconds (valid until the year 2286), 13 digits as milliseconds, 16 as microseconds, and 19 as nanoseconds. You can always override the detected unit manually if it guesses wrong.

Question 3

Is my data sent to a server?

Accepted Answer

No — every conversion, including batch mode, runs entirely in your browser using JavaScript's built-in Date and Intl APIs. Nothing is transmitted anywhere.

Unix Timestamp Converter

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